A PLAUSIBLE and serious corruption case involving an Australian law enforcement agency has been investigated appropriately and will not be looked at further, federal Home Affairs Minister Bob Debus said today.

The case, details of which have not been made public, was the subject of a secret year-long investigation by the watchdog that oversees the Australian Federal Police (AFP) and other crime-fighting agencies, the Australian Commission for Law Enforcement Integrity.

Mr Debus reportedly received an assessment from the watchdog in March following a protracted and detailed investigation involving four secret hearings and the use of coercive powers allowed under special laws.

The report said the case was "plausible and serious".

The agency was not named and Mr Debus refused to say today which agency was involved.

"That report actually specifically recommended that I do not reveal the details of the matter that had been raised and specifically indicated that the matter was old, indeed that the accusations were not all that plausible," he told Sky News.

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Mr Debus said advice to him was that the matter did not warrant further action.

"The advice to me in that particular matter is that the accusations should not indeed be revived, that they were investigated appropriately at the time," he said.

"I was specifically advised not to talk about them by the body responsible for the integrity within our police services.

"We are talking here about an integrity commission who's giving that advice.

"If I can't accept the advice of an integrity commission in a matter like this, what's the point in having an integrity commission?"

INDEED !

I have lodged my May NEIS form and purchased the first two series of Doc Martin for $39.95 (that's the first two series for the price of one)